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Editorial Team
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Asked: 2026-05-12T05:06:07+00:00

I have created a chart using JFreeChart inside a JSP. I want to render

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I have created a chart using JFreeChart inside a JSP. I want to render this chart in a webpage using JSP, without storing the image as JPEG/PNG file. This is in the google app engine environment which does not support writing to disk.

I tried the following:

java.awt.image.BufferedImage chartImage = targetChart.createBufferedImage(600,400);
ServletOutputStream out1 = response.getOutputStream();
JPEGImageEncoder encoder= JPEGCodec.createJPEGEncoder(out1);

but ended up getting a 

java.lang.IllegalStateException: STREAM

BTW, java.awt is also not allowed in the app engine environment. What options do I have for solving this problem?

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1 Answer

  1. Editorial Team

    Just to clarify, the above JSP code is for JSP that’s specified in <img src="...">, right?
    Make sure you have no spaces / new lines anywhere outside of <% %> tags on that page, otherwise they’ll be written to JspWriter which would prevent you from obtaining OutputStream. I’m pretty sure that’s the problem you’re having now.

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